N2气氛下煅烧的黄铁矿对As(Ⅲ)的吸附作用  

Arsenic(Ⅲ) removal from solution by heat-treated pyrite under N_2 atmosphere

作　　者：史亚丹[1] 陈天虎[1] 李平[1] 杨燕[1,2] 彭书传[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,纳米矿物与环境材料实验室,安徽合肥230009 [2]Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland

出　　处：《岩石矿物学杂志》2016年第2期363-370,共8页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(41402029)

摘　　要：微量As（Ⅲ）是水中较难去除的毒性物质,天然黄铁矿对水中As（Ⅲ）的去除能力低于磁黄铁矿.将黄铁矿在氮气下高温煅烧使其转变为由磁黄铁矿构成的多孔结构化材料,具有较高的比表面积和表面化学反应活性,在地下水As（Ⅲ）去除方面具有潜在的应用前景.考察了煅烧温度、煅烧时间、pH值以及溶解氧对去除水中As（Ⅲ）的影响.结果表明黄铁矿煅烧生成的单斜磁黄铁矿对As（Ⅲ）具有最佳去除效果,最佳煅烧条件为600℃煅烧1 h;在水溶液有溶解氧条件下煅烧黄铁矿去除As（Ⅲ）的适宜p H值范围较宽（4～10）,而在水溶液缺少溶解氧条件下适宜pH值则变为7～10;煅烧黄铁矿在有氧水溶液中对As（Ⅲ）的吸附比缺氧水溶液中的吸附效果好.Arsenic（ Ⅲ） is toxic and rather difficult to be purified from water. Natural pyrite has a lower capability to remove arsenic（ Ⅲ） from solution than pyrrhotite. However, when heated in nitrogen gas, most pyrite generates pyrrhotite, which is a kind of porous material which has high surface area and stronger chemical activity and is very useful for arsenic（ Ⅲ） removal from groundwater. In this paper, the authors investigated the influence of heating temperature, heating time, p H and dissolved oxygen on the removal of arsenic（ Ⅲ） by heat-treated pyrite. The results show that monoclinic pyrrhotite has the best removal efficiency for arsenic（ Ⅲ）, and hence temperature of600℃ and time of 1 hour seem to be the best calcinations condition for arsenic（ Ⅲ） by heat-treated pyrite. Moreover, an optimum p H in the range between p H 4 and p H 10 was observed for arsenic（ Ⅲ） removal from aerobic aqueous solution, while a range between p H 7 and p H 10 was observed from anaerobic aqueous solution. Contrast to anoxic environment, the sorption efficiency and sorption rate of arsenic（ Ⅲ） on heat-treated pyrite is much better from aerobic aqueous solution.

关 键 词：煅烧黄铁矿 As(Ⅲ) 除砷 

分 类 号：P578.292[天文地球—矿物学] P579[天文地球—地质学]